创建一个Windows应用程序，使用多线程来扫描一个网段内的计算机，根据计算机的IP地址获取其Dns域名，若计算机不在线，则返回提示信息。-Create a Windows application, the use of multi-threaded网段内to scan a computer, according to the computer' s IP address to obtain its Dns domain name, if the computer is not onlin